Express the size of the giant dragonfly as a percentage of the size of the modern dragonfly. Show your work.

Acombination reaction is when two or more combine to form one product. a decomposition reaction is when a substance breaks down into two or more simpler substances in a chemical reaction.

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.